The greatest genocide of Bangladesh was perpetrated in Chuknagar of Khulna District on 20th May of 1971. Only on that day about 10 thousand people-men, women and children - were killed. Yet the recorded history of liberation war of Bangladesh does not mention this massacre. On completion of the 40th year of the day of Chuknagar Massacre ICBS commemorates the day through the publication of this book. (It was first published in Bangla in 2001). Through this book we avow our ever indebtedness to the martyrs who had laid down their lives to bring the freedom for us. At the same time, through this book we hereby present the documented evidence of the Genocide.